MOSCOW (Reuters) -Russia has reported "isolated cases" of COVID-19 with a subvariant of the Delta variant that is believed to be even more contagious, the state consumer watchdog's senior researcher said on Thursday.
The researcher, Kamil Khafizov, said the AY.4.2 subvariant may be around 10% more infectious than the original Delta - which has driven new cases and deaths to a series of record daily highs in Russia - and could ultimately replace it.
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